responsible for the formation of disulphide bridges
3.
removed during maturation of pro-insulin to insulin
4.
responsible for its biological activity
(3) The connecting peptide or C-peptide is a short protein containing 31 amino acids. It connects the A and B chain of proinsulin molecule. After the processing of proinsulin molecule, C-peptide is removed leaving behind A and B chains which bound together by disulphide bonds to constitute a insulin molecule.
